Various Protections - Fujitsu ASU 9RLF Service Instructions Manual

22. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL
The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.
When the discharge temperature becomes higher than Temperature ,the compressor frequency
is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until
the temperature becomes lower than Temperature .
When the discharge temperature becomes lower than Temperature , the control of the control of
the compressor frequency is released.
When the discharge temperature becomes higher than Temperature
and the indoor unit LED starts blinking.
(Table18 : Discharge Temperature Over Rise Prevension Control / Release Temperature)
ASU9/ 12RLF,15RLS
2. CURRENT RELEASE CONTROL
The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit velue that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.
(Table19 : Current Release Operation Value / Release Value)
[ Heating ]
ASU9RLF
OT (Control / Release)
62.6°F(17°C)
53.6°F(12°C)
41°F(5°C)
OT : Outdoor Temperature
[ Cooling ]
ASU9RLF
OT (Control / Release)
114.8°F(46°C)
104°F(40°C)
OT : Outdoor Temperature
Temperature
Temperature
219.2°F
(104°C)
ASU12RLF
OT (Control / Release)
5.5A/ 5.0A
62.6°F(17°C)
6.0A/ 5.5A
53.6°F(12°C)
7.0A/ 6.5A
41°F(5°C)
7.0A/ 6.5A
OT : Outdoor Temperature
ASU12RLF
OT (Control / Release)
3.5A/ 3.0A
114.8°F(46°C)
4.0A/ 3.5A
104°F(40°C)
5.5A/ 5.0A
OT : Outdoor Temperature
01-16
,the compressor is stopped
Temperature
213.8°F 230°F
(101°C) (110°C)
ASU15RLS
OT (Control / Release)
5.5A/ 5.0A
62.6°F(17°C)
7.0A/ 6.5A
53.6°F(12°C)
7.5A/ 7.0A
41°F(5°C)
8.5A/ 8.0A
OT : Outdoor Temperature
ASU15RLS
OT (Control / Release)
4.0A/ 3.5A
114.8°F(46°C)
5.0A/ 4.5A
104°F(40°C)
6.0A/ 5.5A
OT : Outdoor Temperature
7.0A/ 6.5A
9.0A/ 8.5A
10.0A/ 9.0A
10.0A/ 9.5A
4.5A/ 3.0A
6.0A/ 5.5A
8.5A/ 8.0A